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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dd2375716f5852f50412fe77c45e86cb51b8cfa099b7697fdc68edfb4c1a2988' 
  AND token = 'UG1nl/vF8hFP85hdj3/Ji4EHk6pud4+tEHu3io6fCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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