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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a147116d7f04d3b2d182d0ced2666638523f6344aaca455523d11797d2cc26ec' 
  AND token = 'ZikBzzoOc0MFqHFqp17OTMGwpAiC4lTokb6ag9SX+QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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