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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b88111a195cfed8a71bfd546a3c46a5a6b345ea8556ba17aefdbb53d937c871b' 
  AND token = 'oAT5rbUMANX2CA0NmgD5+wb19iZpZ6cb9ctC7owsnTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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