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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f58facd5d194342e2909b023dfb3be1a82780ff7b851d30ef3e3374859e2768c' 
  AND token = 'l2JEVRzmfkvF6M8QIMz7rXcm5r1CDxCPXlx47HP9ZM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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