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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '564862d54b410ef3f49fe6a012bc646ad7ae0c1f4176c40c455b65ae0d988674' 
  AND token = 'A01Bdtnzsu9/MuNOeiJYSt2ecT0I9vkiKO4jTwdPmTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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