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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a11bdcc81b847ac5b27f8c44dabe3e9b15e1582dea2e708d30860ee64ae6ced' 
  AND token = 'WkE092BgQDFuGwfbnqIBUuYurT+AMzlXEfuN46FQSt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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