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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8dc9bfe718a30796cc9642f0669133974ef9d60daa261fff846193bba735a5a' 
  AND token = '8EIYeo2o3yk11W7cYrg7zm+JvvxcypjfuQenaiv/Rdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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