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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9997b9a8cffa1106077bd116c05f4a145f42b823cd8363643ce5e7fd0d8b6e1b' 
  AND token = 'Hd7etD+5ucdUPami0G9WOJGiOdhx1f1koidNfR8VtGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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