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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f44dbf20e372e3f3655181c6e51335af784e103921439b6416255220aa614031' 
  AND token = '6SbJeaw/CmI5ysb5pYFVOW1vibvwDFSWqEEd6hhKnjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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