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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b0d63391bdf47bda565fb70a4ba9739a2b495ab0c2ec2ddbe8bd1b353ddb9ba5' 
  AND token = 'yzpyLzB32h/dh4QYV26UgT3WZ/b9QHsdneNk1yapTb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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