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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a2fde540ebe0fbd21f0241e48918541f4666d15ca48d5ac6b6268542cdf799d' 
  AND token = 'ScrpGoEIIygsoU9ruPcXWUVB/5h1kDso4qXgkw4qb9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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