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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '122ea17eac6d4ce2d788bd2ed288a4a65bad522abdaec65689d8067aa4597dc9' 
  AND token = 'zexeC++Lvwq+qiS4OhLnp+1rnIhsNd2+rK8bMoB+Qek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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