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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b47103974573b83fdea01ba54fa30a12a2d354f72a338172321ab403fd1f2917' 
  AND token = 'mpNCYa0qUfmSqF+WVzOoqSF/Od5YsDyQ/XAsLRW6RvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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