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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8c22bc62117851b9f3a3540f2f077973af8a74b2d4dfb434242d1f64ef8e872f' 
  AND token = 'npj1Rn4Yd6O8fnR+eK1alKNcYZVtnywAsRiO5Q8XSqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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