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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd00046c27217199a42dc6ebe2de7bc6c4af3f868ea846b50bc0e0e11891c811' 
  AND token = '/CwS4l0Lbq5zhAaXiNtXQh1rED41syqBFqSpirz5ESM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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