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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5eebae9e244e87ed9568b0c5472f6f76395273464a1785d4cc87af1332240b80' 
  AND token = 'WNYOn1Ds9SDbCVD+xP/ge0DngW32RV+NdO57/jz6Ygs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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