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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7c30709ac39a8c408382d853a29f53f2c3d11c225539dcf4ad053e099a97a7a' 
  AND token = 'o3PMHS6t8aKu6xAdn8FhMAk6lyMg0OhFH9gn/LzvzC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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