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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3aadb9a66e9fac0aec853436c4414865f0e3e72e8bafec7844d4d98bd8ca5f96' 
  AND token = 'EW2w+huRN/NIoP4guFLOLzrBQqA45yuYi18tqRTFITo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}