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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '53ea188b4284530030118a0ab497fd0453f8d099534a52d9d2f28318b10e1798' 
  AND token = '/NEqq+U9e0bhssaZtUlf8+xW/VOM2bDI46n7I4YScvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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