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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7768fdaaff30472e5689ccf909ccc1d5055a3a74b91c72a0ffebb293d0d8137' 
  AND token = 'gBVdVjp7htVMy6Oao0kzMqzgpaEfkqf/QDnC3MFFQ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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