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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '28acd7ae78fbc73f058c8c85c540dca4c5d44c0d3ed84b3a2f66a83328ef9096' 
  AND token = '9o2s+6hTzp34xvsAhsaonAWQWe3hifjY8ilwhxYwZy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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