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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f3ae153c4284e334c9539401aca165bb2e4dc5079b4143c26ec79af831ba59c' 
  AND token = '/b2hmWK6BlsbbNwvX4mupv7R8j7Q00p4H0bswFhvBRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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