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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ed18fed032b008798f6695697ce1728dc2e174cfe60dc67b26f4d4d1a92b1c2' 
  AND token = 'tqgxc1mYS9EURyXJccEMKc9KFwalp37rmkjnhHpk550=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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