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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a349d8c655a5bba6f9ab04adc806359fbde818b2944e108193687f6ceaac5e2' 
  AND token = 'XiPkGfP8onCIFv0YUeMlb/cBsyZAEKLpHOScX3Cp9KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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