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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd0e7d0cb85640cfa6ee0be32953d753e0cb47d47d3ed555c22e00ac5a0557e1' 
  AND token = '697czoeIU3CQYXzvInqSP+3mD7T+FeRQSO+961JPccY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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