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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de52ff8d9dc37cf5b3a96078ac7e6a23bbee24f8e782a11d0dd6118413b9f54e' 
  AND token = 'SJbWBcZhY+BnudEuIhbtuqDNm12MkOR6k5mbdmhBThQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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