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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4fffa60bd957ec90a3aafde76b1aa07384cb66f89057d91dcb9d7cb2a5be57f0' 
  AND token = 'wod4bSbkFKeDotmErqjc5nq/P4jZ3D8dDVdVcL4FnIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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