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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f081eba12daa7bbd271b26b264fdb7c94ab0ce017907a2ec7dd0d7f37e850bf9' 
  AND token = '3XlbTPJRebwOfUnBk77WprBX7x87pqagDXn1zG+FTSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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