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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9635b8dee2d07f53666707f3669555a3ee150400defbf86360630e825fd94e4' 
  AND token = 'E+flOi3cVbcSb3LMuIKX0fGq0ZTysMq90MYIbs4gWMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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