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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0caa61e0610dcab4e612164b3aca75e0f07bd5d1527d3d30622e15a00a53c15a' 
  AND token = 'SKYrC8TLXNUXQf41fU3DZztIFqgUU1Ol5dnPBmJDCSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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