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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5c6ceaba5e60173bf3da13985f1f1042389bd54a0edbc48e2e47406b3347f335' 
  AND token = '/dfCRlI5xsldSiKlUYF25mZX2yuV8Pgyk17n0ni5nxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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