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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8df5f5fa4d447ca490112880597dfc9d9ad9829695042d3ed3c259d524637824' 
  AND token = 'qV/xaS+1pbcNyKzlSRoNN0EAz+nEGeeo5QeOb/l+2HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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