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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab81993b1d12552b641e4ce34ce074a81ae64ba4bbf9e3922d1eef07a007faf9' 
  AND token = 'Um4APOyYEefLB8JTh6mWfJNmUZyJLVMtS4huwiaG7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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