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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fcb846d79df1abad35ec924d2c6d7490ba54278b84502cc40b7882ecd056245b' 
  AND token = 'TJN645uWfrq+AFIv29AW5nx5eAjaXl+UwS4Bsmr1Ge4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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