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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '98a6d565ab635d1fcd0114b4e6dd4d24405c6b0b2666b98605ed11d0a92bb389' 
  AND token = 'Cqr5kr0rS1uA0Bx2y5HeWTLzXEyJxzzNOS6tXL82Dk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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