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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb70d7543b68f7597d377bb74647cfbb0bcc33647d4d051576135763e6ce0818' 
  AND token = 'wH0vFrWG/SfvGm3TeqlKeb+Y8iPm1I4Zl7cT8/wEktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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