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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be49017837a38b9322630b9a862ada576ba60651ba5d5e9479a74f1c18833bd1' 
  AND token = '1iH7IgKyftvI2MKn15MbUKYG0IatL3Xg8m+LlXKqIDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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