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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dc953ef110693daa653653aaf55e542ce935d765fdaa9939eab13bc4a42387e' 
  AND token = 'H7kMu82VU9twEhgH1lgW4s6cTe48QQDFT0gC43fbchQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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