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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45a47192ead05e4211f0bf73c555226a3d18ec38d44c5e672f3d067773ffad01' 
  AND token = 'UGzjo5uLDcmjPMRSdng4OKqsrjcYL2CAuFLJ2kSkCU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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