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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9dc426188f9ccee2fec94c34e28271aa6022b3afc8a5c6ba161e5ca443582947' 
  AND token = 'agfmP0yPHnPne9eMhLrxqAx7sqFZ/axwE9ka9cxGCgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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