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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '304036f012b4013977719958ce83b975bd0421cb207afc63d4e29947be353481' 
  AND token = 'X5tnTl7r7ApmjMNkLy02D5ByM2fAtgyAHKc+y9SqU3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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